Initially, the reader is shocked by the crude drawings of explicit sexual genitalia. However, the reader is somewhat calmed when it is apparent that they are academic anatomical diagrams. This calm is interrupted, though, when it becomes apparent that the images are being taken in a TGI Fridays restaurant on a dining table and that drawings of an erect penis would have been displayed if someone at the restaurant didn’t catch them, causing them to flee.
The author also notes that he thinks this may be how the anatomical photos on Wikipedia may really be taken, and that you can’t tell they’re in a place such a restaurant due to careful cropping of the photos.